Introduction Methane in the earth atmosphere is an important greenhouse gas with global warming potential 23 times greater than carbon dioxide and considerable evidence of climate change is also associated with emission of greenhouse gases (GHG), mainly carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O), in the atmosphere (IPCC, 2007). The primary sources of methane emission may be divided into natural (30%) and anthropogenic (70%) (Wuebbles & Hayhoe, 2001). Among the anthropogenic factors agriculture, including animal production is a major sector with highly significant contribution to environmental pollution. According to Steinfeld et al. (2006), 80 million tonnes of methane is released annually to the atmosphere from animal production through enteric fermentation.
Scientists also predicted that the average temperature could increase between 1.4 to 5.8°C by the year 2100. Greenhouse gases can cause global warming. Based on Collins Dictionary, The greenhouse effect is the problem caused by increased quantities of gases such as carbon dioxide in the air. These gases trap the heat from the sun, and cause a gradual rise in the temperature of the Earth's atmosphere. Gases such as carbon dioxide, sulphur dioxide, methane, nitrous oxide, halocarbons and so on, built up in the atmosphere due to increased use of energy and the expansion of global economy in the 20th century.
Introduction According to Botkin & Keller (2014), fossil fuels are forms of stored solar energy created from the incomplete biological decomposition of dead and buried organic material that is converted by complex chemical reactions in the geologic cycle. Fossil fuels provide about 90% of the world’s commercial energy supply (Botkin & Keller, 2014). Energy is essential in socio-economic development and one of the basic requirements for human life and technological advancement (Akuru, Okoro & Chikuni, 2013). Use of fossil fuel energy by humans has led to significant environmental problems such as air and water pollution, acid rain, global warming as well as human health impacts. In this paper, we will address the environmental and human health impacts caused by fossil fuel energy and how alternative energy sources can benefit humans and the environment.
The fossil fuel and nuclear fission are the energy sources which are needed to produce electric power. The burning of fossil fuel produces the harmful gases and other toxic metals to the environment. In case of nuclear fission, material will remain deadly for thousands of year and produces radioactive waste. Renewable energies are playing a vital role in supplying the world’s required power demands. The photovoltaic power generation system keeps growing in the last few decades to produce promising source of energy.
“An approximate value for a 50-year-old oak forest would be 30,000 pounds of carbon dioxide sequestered per acre”, “ The forest would be emitting about 22,000 pounds of oxygen.” said Timothy J.Fahey, professor of ecology in the department of natural resources at Cornell University. Based on those numbers, it is obvious that forests play a fundamental role in the Earth since they brings lives to creatures including mankind.Their power, therefore, is used widely to tackle the air pollution of many countries. In Vietnam, forest cover density positively increased from 28% in 1942 to 41% in 2014( Thao Nguyen, November 26th ,2014), which brings an optimistic result to Vietnam’s environment. However, illegal logging and deforestation still exist. Marianne Brown’s article also said that: “Over the past 40 years, the country has lost 43 percent of its forest
Nowadays climate change is one of the actual problems facing our planet. It is mainly caused by anthropogenic emissions of gases from burning fossil fuels, electricity, improp-er use of minerals and other factors. As a result, we have got our ecological situation worsened as the technological progress has grown. Of course, there exist a number of green organizations, trying to prevent damages made to our planet and promoting ecolog-ical use of materials. But in this report I aim to describe and analyze companies from envi-ronmental sustainability’s perspective.
Many experts attributed the root cause of climate change to human activities that comes with the rapid growth of the global economy including human consumption of different sources of energy, rapid rate of deforestation and bush burning. The negative impacts of climate change on crop production, higher average world temperature, rising sea levels, reduced rainfall, amongst others are largely indisputable in the literature. A high taxes on carbon-intensive fuels like coal could reduce their consumption and hence carbon
INTRODUCTION According to The Star (2015), as technologies becoming very advanced, now people are starting to be very dependent towards technological things such as vehicles, machine and industrial activities. This leads us to suffer from many harmful gasses such as greenhouse gasses which primary sources of carbon dioxide. Carbon dioxide is the primary greenhouse gas release through human activities. In 2013, Carbon dioxide contribute for about 82% of all U.S. greenhouse gas emissions from mankind activities. Carbon dioxide is naturally present in the atmosphere as part of the Earth 's carbon cycle that is the natural circulation of carbon among the atmosphere, oceans, soil, plants, and animals.
Carbon dioxide is not only released through the burning of fossil fuels. Carbon dioxide is also released by volcano eruptions, human activities, such as deforestation. We, humans have increased carbon dioxide concentration in the atmosphere by more than a third. Many countries have been using fossil fuels as their main source of energy, this is one of the causes of the increase in the concentration of carbon dioxide in the air. China and India for example, are one of the major users of coal.
No one can deny that fossil fuels are performing a very important and essential role in our society today. Coal, Natural gas, and crude oil are the world’s fundamental sources of energy. All of them took millions of years to be formed during the Carboniferous era that was before dinosaurs’ era (Fast Facts About Fossil Fuels, 1998). They are the result of the rottenness of plants and animals which were buried deep in the soles of the hemisphere. Fossil fuels are pumped from underground and are used in many different ways.